Dual spring multi-fiber optic connector

ABSTRACT

A fiber optic connector having a set of opposing pins set in a recess configured to accept a corresponding spring therein. The springs are placed on either side of the fiber optic cable bundle and secured within a pinkeep. The dual or outer springs help prevent rotation of the ferrule assembly during use.

CROSS-REFERENCES TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No. 16/407,603 filed on May 9, 2019, which claims priority to U.S. Provisional Application No. 62/682,012 filed on Jun. 7, 2018, which is incorporated herein by reference in its entirety.

FIELD OF THE INVENTION

The present invention relates to fiber optic connectors, and more particularly, to fiber optic connectors with a dual spring assembly for improving assembly and reducing manufacturing cost.

BACKGROUND OF THE INVENTION

Modern high capacity optical systems often utilize fiber optic ribbons for inter-system connection. As there are multiple connection points in an optical path, and a spring is typically required to bias forward a ferrule assembly, there is a need to simplify assembly of the fiber optic strands or cable containing multiple strands by removing the single spring.

SUMMARY OF THE INVENTION

According to the present invention, a fiber optic connector comprises a ferrule housing with at least ferrule and at least one fiber optic strand. In a traditional MPO fiber connector, as shown in FIG. 1, a single spring is configured to encircle a fiber optic cable with one or more fiber strands. In the present invention, the ferrule housing is configured to accept two springs preferably positioned on either side of the fiber optic strand or strands.

In a traditional process after a curing step is complete to attached fiber optic cable or strands to a ferrule housing, a spring is installed around the cable or fiber bundle. A disadvantage is this spring rattles when the connector is used, and can result in displacing the ribbon. As the spring rattles it can become lose resulting in connector failure. The spring can become offset for example. Also, the MPG ferrule assembly, backpost and pin keep are separate parts that due to tolerance and assembly difficulties (due to size), interfere with a smooth push/pull operation of a standard MPO connector.

In the present invention, a backpost further comprises one or more pins configure to retain a spring on side of a fiber bundle. A corresponding pin opposing and in line with a first pin on the back post, accepts a second end of the spring. During operation, the MPO connector outer housing is urged forward at a distal end (away from the ferrules). This compresses the one or more springs, and a latch attached to the outer housing mates with corresponding adapter structure to secure MPO connector therein. The spring biases connector outer housing in a distal direction holding MPO connector within said adapter.

In a second embodiment, distal pins on ferrule assembly are integrated to said ferrule outer housing. At a second end, a latch is formed within pin lead that catches in a recess formed a proximal end of an outer latch, which secures the MPO connector to the adapter as described above. Further in all embodiments, outer housing springs (725 a, 725 b) are replaced by a single spring reducing connector material and assembly cost, while reducing size.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the invention are described in more detail hereinafter with reference to the drawings, in which:

FIG. 1 depicts a multi-fiber push on/push off fiber optic connector according to a first embodiment of the present invention;

FIG. 2 depicts an exploded view of the connector of FIG. 1;

FIG. 3 is a standard MPO connector;

FIG. 4A depicts an alternate latch embodiment of a standard MPO connector;

FIG. 4B depicts a side cross-section view of FIG. 4A;

FIG. 4C depicts a perspective view of FIG. 4B;

FIG. 5 is an exploded view of the MPO connector of FIG. 4A prior to insertion into an adapter;

FIG. 6 is the MPO connector of FIG. 4 according to a second embodiment of the present invention;

FIG. 7 depicts an outer housing latching to inner housing of a standard MPO connector with the dual spring embodiment;

FIG. 8 depicts another embodiment of MPO connector according to the present invention;

FIG. 9A depicts a perspective view of a backbody according to an embodiment of the present invention;

FIG. 9B depicts a perspective view of a pin keep according to an embodiment of the present invention;

DETAILED DESCRIPTION

In the following description, apparatuses for assembling a MPG connector and latching the same to a fiber optic adapter is disclosed. It will be apparent to those skilled in the art that modifications, including additions and/or substitutions may be made without departing from the scope and spirit of the invention. Specific details may be omitted so as not to obscure the invention; however, the disclosure is written, to enable one skilled in the art to practice the teachings herein without undue experimentation.

FIG. 1A depicts MPO or multi-fiber push on/push-off fiber optic connector assembled according to the present invention. Connector 100 comprising ferrule assembly 108 with one or more ferrule openings, pair of pins extending from pinkeep 105, inner housing 101 configured to hold assembly 108, and outer housing 102 that slides over inner housing 101. Raised edge 103 stops the forward movement of outer housing 102 and a cable assembly with boot 104 attaches a fiber bundle having one or more fiber optic strands.

FIG. 2 depicts an exploded view of FIG. 1. Outer housing 102 accepts ferrule assembly 107. Pinkeep 105 is received within distal end of assembly 107. Pinkeep 105 has a pair of opposing posts or pins that receive a spring (106 a, 106 b), and backbody 108 receives an opposing end of springs (106 a, 106 b). Backbody 108 openings receiving springs 106 and opposing posts retain the springs on opposing sides of a fiber bundle, and reducing spring rattle.

FIG. 3 depicts an exploded view of standard MPO connector 300. Ferrule assembly 307 receives ferrule alignment key 307 a that is received in pinkeep 305. A single spring 306 is pressed against the distal end of pinkeep 305 by backbody 308.

FIG. 4A depicts MPO connector 400 according to an embodiment of the present invention. Pinkeep 405 with extended arms 405 b, arms configured with reverse bend 405 c, are accepted into recess 402 a of outer housing 402. Outer housing a pair of opposing protrusions (112 a, 112 b) that when depressed inward by pair of latches (111 a, 111 b), the protrusions are captured in a corresponding cutout within an adapter outer housing (not shown). Pair of pins 105 a protrude from pinkeep 405 at a proximal end thereof.

FIG. 4B depicts a cross-section side view of FIG. 4A. Recess 402 a is disclosed with extended arms 405 b secured therein. In FIG. 4B, like elements of FIGS. 1-3 are also disclosed. FIG. 4C depicts a partial cross-section view of FIG. 4A, with backbody 408 integrated with a pair of depressable latches (411 a, 411 b) that when depressed, latch body retreats into clearance area 408 a. This clearance area 408 a allows protrusion 112 a (112 b not shown) to clear an inner wall of an outer housing an adapter, so said protrusion can be secured within cutout of adapter wall thereby securing said MPO connector therein.

FIG. 5 depicts a fiber optic adapter 550 configure to accept a MPO connector 400 at either end. Cutout 590 a accepts protrusion 112 a. FIG. 6 is an exploded view of connector 400 with a second backbody embodiment. The extended arms 405 b are accepted into openings (615 a, 615 b (latter not shown)) of outer housing/back body/latch combination 610 (or 410 of FIG. 4A). A corresponding spring 606 a, 606 b) is received in opening 616 b for spring 606 b, to secure said spring from rattling. Spring rattling increases connector failure. Latch 611 used to secure MPO connector to an adapter (not shown) further comprises recess 614 that accepts adapter structure to secure connector within adapter, and protrusion 612 that forms recess 614 with latch 611.

FIG. 7 depicts a front portion of a standard MPO connector. A pair of outer housing springs (725 a, 725 b) are not found in connector 400 of the present invention. Ferrule bias spring 106 is positioned around fiber optic cable bundle 113, which increase assembly cost and connector failure due to spring rattle. Unlike the present invention, proximal end of spring 106 seats up against distal end 107 a of ferrule assembly 107, were the spring rattle loosens fiber cable assembly that is glued into distal end of ferrule assembly. Back stopper 720 can help retain spring 106 from moving.

FIG. 8 depicts a MPG connector 800 according to another embodiment of the present invention. Backbody 808 has pair of opposing pins (815 a, 815 b) that accept distal end of springs (806 a, 806 b) respectively to reduce spring rattle. Pins 815 are contained within a corresponding recess 816 that further reduces spring rattle. At a proximal end of spring (806 a, 806 b), with proximal end defined near ferrule assembly 107, pair of opposing pins (817 a, 817 b) to distal pins (815 a, 815 b), accept a first end of corresponding spring (806 a, 806 b). Pins (817 a, 817 b) are integrated with ferrule assembly at a distal end thereof. Pins (817 a, 817 b) further reduce spring rattle.

FIG. 9A depicts backbody 908, pin keep 105, and latch 112 assembly combination 910. Pins (815 a, 815 b) accept springs (806 a, 806 b) at a second end or distal end, within corresponding recess (932 a, 932 b) for pins (815 a, 815 b) respectively. FIG. 9B depicts a second embodiment of pins (817 a, 817 b) that extend from an opposite end of pinkeep 905, and corresponding recesses (930 a, 930 b) that accepts a second end or distal end of corresponding springs (806 a, 806 b). FIGS. 9A and 9B discloses pins with a recess at a first end where the pins are secured as part of the pinkeep. The pins are configured to accept the springs, and the springs at a first end rest within the recess formed as part of the pinkeep. The pins and recesses help reduce rattle that can lead to ferrule assembly displacement and signal loss.

An ordinarily skilled person in the art can appreciate that by following the principal of the present invention, a version of the adapter for mating a multi-fiber optic ferrule connector with another multi-fiber optic ferrule connector can be derived without departing from the scope and spirit of the invention. Although the embodiments of the present invention described herein are related to multi-fiber optic, applications, the present invention can be adapted to single fiber optic applications. Specific details may be omitted so as not to obscure the invention; however, the disclosure is written to enable one skilled in the art to practice the teachings herein without undue experimentation.

The foregoing description of the present invention has been provided for the purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise forms disclosed. Many modifications and variations will be apparent to the practitioner skilled in the art.

The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, thereby enabling others skilled in the art to understand the invention for various embodiments and with various modifications that are suited to the particular use contemplated. 

What is claimed is:
 1. A fiber optic connector comprising: a ferrule having a front end portion and a rear end portion spaced apart along a longitudinal axis, the front end portion of the ferrule being configured to expose a plurality optical fibers for making an optical connection; a pinkeep separable from the ferrule, the pin keep having a front end portion and a rear end portion spaced apart along the longitudinal axis, the front end portion of the pinkeep being located rearward of the rear end portion of the ferrule, the pinkeep defining a longitudinal fiber channel that extends from the rear end portion the front end portion, the longitudinal fiber channel fiber being configured so that optical fibers are passable longitudinally through the longitudinal fiber channel into the ferrule for being exposed by the ferrule for making an optical connection; a first pin fixed to the pinkeep and extending rearward from the rear end portion of the pin keep on a first side of the longitudinal fiber channel; a second pin fixed to the pinkeep and extending rearward from the rear end portion of the pin keep on a second side of the longitudinal fiber channel opposite the first side; a first spring received over the first pin; and a second spring received over the second pin; wherein the first spring and the second spring are configured to bias the ferrule forward and further stabilize the ferrule in the fiber optic connector. 